Nested radio groups incorrect behavior

[codekrolik]

Description

Nested radio groups behave incorrectly.
Selecting a parent item affects selection of nested radio groups.

Expected outcome

When parent radio-group selects an item, only parent item should get selected and nothing else.
When nested radio-group selects an item, only item in nested radio-group is getting selected and nothing else.

Actual outcome

When parent selects an item, nested radio group also selects items, whether you want it or not.

Live Demo

https://jsbin.com/kiwoqunice/edit?html,css,js,output

Steps to reproduce

1. Open https://jsbin.com/kiwoqunice/edit?html,css,js,output
2. Select parent item #2 (Remove all links)
3. Nested radio-group items will get erroneously selected

Browsers Affected

• Chrome

[notwaldorf]

Nested radio groups are not supported at the moment, since the underlying iron-selector element does not support it. This is the tracking issue for that feature: PolymerElements/iron-selector#42